The best seating of complete crowns during cementation can be achieved by venting the crown and using a tapping cementation technique. When the crown is not vented, a dynamic seating method provides the best seating. 39 Impressions were made, stone dies fabricated, die spacer was applied and the crowns were waxed and cast in type III gold. The respective crowns were placed on the teeth and preloaded. The distance between reference marks on the tooth and crown were measured at four points around each tooth. Zinc phosphate cement was mixed and the crowns were cemented in the following groups: 1) vented, tapping the crown into place with a mallet, 2) non-vented, tapping the crown into place, 3) vented static seating with a 25 kg load, 4) non-vented dynamic seating, 5) non-vented static loading with a 25 kg load. A 25 kg load was then maintained on the crowns during the cement setting time. Distances between reference marks were then measured and the change in post-cementation distances calculated.Results. ANOVA (F=14.995, p<.0001) and multiple range tests revealed significant differences between the groups. The mean increased postcementation distances for the seating groups were (µm): 1) 132 ± 20, 2) 372 ± 26, 3) 367 ± 59, 4) 239 ± 35, 5) 537 ± 45.

No abstract

No abstract

No abstract

No abstract